Cesae felix josz



UNrrED STATES PATENT QFFICEW CESAR FELIX JOSZ, OF BOOKENHEIM, ASSIGNORTO VICTOR EMDEN, OF FRANKFORT-ON-THE -MAIN, GERMANY.

PRODUCING PRINTING-PLATES.

SPECIFICATION forming part of Letters Patent No. 334,234, dated January12, 1886.

Application filed June 25, 1885. Serial No.169,760. (No specimens.)Patented in France October 3, 1884, No. 164,594; in-Belginm October 4,1884, No. 66,499; in Germany October 7, 1884, No. 33,312; inAustria-Hungary December 1, 1884, No. 38,399 and No.

56,532; and in England April 18, 1885, No. 4,816.

'f 0 all whom it may concern.-

Be it known that I, OiisAR FELIX Josz, a

citizen of France, and residing at Bockenheim, Germany, have inventednew and useful Improvements in Printing-Plates, of which the followingis a specification. The novelty of this process for preparing metallicplates for printing consists, first, in the practicability of at onceobtaining from a metallic printing-plate after the drawing has beenprepared and without preliminary etching or gumming an unlimited numberof Very fine impressions in an unvaried style; second, in rendering alllithographic Work practicable by means of metallic printingplates onwhich thereisnolayerorcoating ofanykind,and from which any desirednumber of impressions may be obtained without special treatment, as hashitherto been always necessary in the case of all zinc printingprocesses, but by means not differing from those usually employed onlithographic stones.

Application of the metallic printing-plates.

A. Printing with metallic plates: The metallic printing-plate,unprovided with a layer or coating of any kind, is engraved with ametallic tracing-point. Then, by means of a brush, the plate is coveredover with color thinned with turpentine, washed over with a damp sponge,and rolled with a lithographic roller. Only the engraved parts takecolor, while the other parts of the surface reject it. The impressionsobtained are very fine and clear, and in this sense the metallicprintingplates supersede not only the stone, but also with advantagecopper and steel plate printing, thus obviating the protracted anddifficult execution by pen, lithographic ink, chalk, photolithography,850.

B. Direct chalk and pen drawings on' the metallic plates themselves, asalso transfers from stone, engraved plates, 850., are executed in thesame Way and with the same means as is the case with stone.

0. Engravings on metallic printing-plates: Printing with metallic platesas set forth under A may after the inking-in be etched in relief forbook-printing as letter-press blocks and thus the business of book-illustration ter-press blocks very quickly and Without previous drawingin ink, chalk, 850., whereby also the individuality of the artist ispreserved with the greatest certainty.

Process for the production of the metallic printlag-plates. I

The metallic plates of every kind are prepared as follows: They aregrained by mechanical means. The grained metallic plates are then forthe purpose of scouring placed in a saturated solution of alkalineearth, chalk being excepted, the best solution being magnesia in water.They are then taken out rubbed, and dried. Then, in order by means of anastringent to open the grained surface previously produced by mechanicalmeans, the metallic plates are sprinkled with a watery solution, whichoperates purely mechanically, the preferred solution being Water,alabaster powder, and alum, after which the metallic plates are dried.Then the layer or coating when dried is washed off from the plate withalcohol. The plate is then ready for pen and chalk and for transfer.

Plates for printing as set forth .under 1 are after preparation asdescribed in the foregoing description, sprinkled over with a solutionof water, sodium water glass, chloride of iron, an organic acid, anddried.

Having thus described my invention and the manner of employing the same,I claim-- The herein-described method of preparing metallicprinting-plates, consistingin mechanically graining metallic plates ofany kind, extracting all grease by means of alkaline earth, and thenopening or raising the grains by means of astringents operatingmechanically and giving the metallic surface the affinity for ink,lithographic crayon, 850., as set forth.

In testimony whereofl have signed my name to this specification in thepresence of two subscribing witnesses.

CESAR FELIX JOSZ.

'Wi tnesses:

FRANZ HASSLAOHER, J OSEPH PATRIOK.

is placed in a position to produce direct let- U

